Propaganda analysis (http://www.propagandacritic.com/) - at the Institute for Propaganda Analysis - includes descriptions and examples of common techniques and some examples of propaganda, including some video examples.
F.A.C.T.Net.org (http://www.factnet.org/) - F.A.C.T.Net (Fight Against Coercive Tactics Network) "focuses on protecting freedom of mind from harms caused by all forms of mind control and unethical influence" - lots of information and resources on cults, scientology and attempts at mind control.
(http://www.adcouncil.org/default.aspx?id=15) - This excellent resource provides a history of many of the public service announcements from the Ad Council over the last 60 years. It includes lots of images and some video. Remember the "Crying Indian" television ad? Watch it here.
Print ads (http://scriptorium.lib.duke.edu/adaccess/) - "The Ad*Access Project, funded by the Duke Endowment "Library 2000" Fund, presents images and database information for over 7,000 advertisements printed in U.S. and Canadian newspapers and magazines between 1911 and 1955. Ad*Access concentrates on five main subject areas: radio, television, transportation, beauty and hygiene, and World War II, providing a coherent view of a number of major campaigns and companies through images preserved in one particular advertising collection available at Duke University."